4. Choose the necessary form of the verb:

1. People ____ automatic tellers to get money. (used, use, will use)

2. There _____ automatic tellers outside banks. ( will be, were, are)

3. They _____ together different machines. (put, puts, will put)

4. In industry computers _____ jobs that are difficult for people to do. (do, did, will do)

5. They also ______ quality of the products. (checked, check, will check)

5. Fill in the blanks with the words:

(electronic, count, print, problems, the speed of light, invented, months)

There are two different types of ________computers: digital computers and analog computers. The digital computers_________. They can add, subtract, multiply, divide, match, collate and ________infor­mation. The analog computers measure______. They are able to do complicated._________ Electronic computers calculate at nearly___________. Electronic computers were ___________to give high-speed answers to large and complicated problems that once took________ for man to do.

Unit 11.

AUTOMATIC VOLTAGE REGULATORS

1. Read and translate the text:

In the generation and distribution of electrical energy it is important to keep the line voltage constant as the load or speed changes. Where the load is changed gradually rheostats are used, in installations where the load may change rapidly automatic voltage regulators are used. To protect electrical equipment and the wiring from damage due to short circuits and overloads, fuses or circuit breakers are usually used. The fuse is known to be a device for inserting in the circuit a strip of metal which melt at a relatively low temperature. The fuse will melt if the current gets above a certain limit. A circuit breaker is similar to the magnetic contactor. A magnetic contactor is used to make and break the circuit at the points where considerable power is used.

2. Remember the new words and expressions:

• Line voltage – лінійна напруга

• Load – навантаження

• Overload - перевантаження

• Speed changes – швидкісні оберти

• Short circuits – коротке замикання

• Electrical equipment – електричне обладнання

• Wiring – дріт

• Fuse – плавкий запобіжник

• Low temperature – низька температура

• Melt – розплавлятися

• Certain limit – відповідна межа

• Circuit breaker – автоматичний вимикач

3. Continue the sentences:

• Where the load is changed gradually rheostats are used…

• It is important to keep the line voltage constant…

• Fuses or circuit breakers are usually used…

• The fuse is known to be a device…

• The fuse will melt if the current…

• A circuit breaker is similar to the…

• A magnetic contactor is used to make and break…

4. Answer the following questions:

1. Is it important to keep the line voltage constant as the load or speed changes?

2. When are rheostats used?

3. What do we know about the fuse?

4. Will the fuse melt if the current gets above a certain limit?

5. What is similar to the magnetic contactor?

6. A magnetic contactor is used to make and break the circuit, is not it?